Replace obscure Fortran coding pattern in liboctave with modern C++ (bug #65343) * CMatrix.cc, CSparse.cc, dMatrix.cc, dSparse.cc, fCMatrix.cc, fMatrix.cc: Add #include for <cmath> and <limits>. Replace all instances of "rcond_plus_one == 1.0" with "is_singular (rcond)". Delete variable instantiation for "rcond_plus_one". * CMatrix.cc, CSparse.cc, dMatrix.cc, dSparse.cc, fCMatrix.cc, fMatrix.cc (is_singular): New static inline bool function to check whether a matrix is singular by checking the size of the reciprocal condition number.

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